The EM1 will track moving subjects better because it has a PDAF array on the sensor. The EM5 and EM10 do not.

The EM5 is a great camera - along with weather sealing and a good set of accessories - the EM5 can be found on the used market for less than a new EM10. If you are looking to save money, and get a good lens or put toward the HDL-6.

The e-m10 has a slightly better viewfinder than the e-m5, the difference is certainly noticeable. The firmware on the e-m10 is also more refined than the e-m5 and there are many small enhancements that are typically not noted in online reviews. Case in point, the raw reprocessing controls are much more refined and you can try out iterative changes. Not so with the e-m5.

The two things going for the e-m5 are the weather sealed all alloy body and the 5 axis ibis. The e-m10 feels very solidly built but it's not all alloy, The 3 axis ibis is very good whereas the 5 axis is superlative. The difference is probably only noticeable at longer focal lengths. Think 1/2 sec sharp exposure v/s 1 sec.

In terms of ergonomics, they feel very similar in hand for size and weight. If someone did a blind test, you would be hard pressed to identify them without pressing the buttons and feeling around.

I haven't tried the non-battery grip for the em10 yet, it's next on the shopping list. Based on its dimensions, and reviews, I suspect it will make a very nice difference without adding to the weight.

Thanks for clearing that out about the viewfinder. What other software improvements, if I may ask?

Things stated above: (maybe it helps to answer my question better)
- I won't be using the PDAF as I will use Leica glass and probably only the 25mm f1.4 panasonic leica lens on it
- Focus tracking.. never going to use it
- Weather sealing.. mhm not necessary for me. My rolleiflex and m6 aren't weather sealed either
- Viewfinder.. It's probably an important thing for me. So what's the difference between the E-M5 & E-M10 in this respect and is it big?

The e-m10 has a slightly better viewfinder than the e-m5, the difference is certainly noticeable. The firmware on the e-m10 is also more refined than the e-m5 and there are many small enhancements that are typically not noted in online reviews. Case in point, the raw reprocessing controls are much more refined and you can try out iterative changes. Not so with the e-m5.

The two things going for the e-m5 are the weather sealed all alloy body and the 5 axis ibis. The e-m10 feels very solidly built but it's not all alloy, The 3 axis ibis is very good whereas the 5 axis is superlative. The difference is probably only noticeable at longer focal lengths. Think 1/2 sec sharp exposure v/s 1 sec.

In terms of ergonomics, they feel very similar in hand for size and weight. If someone did a blind test, you would be hard pressed to identify them without pressing the buttons and feeling around.

I haven't tried the non-battery grip for the em10 yet, it's next on the shopping list. Based on its dimensions, and reviews, I suspect it will make a very nice difference without adding to the weight.

In terms of ergonomics, they feel very similar in hand for size and weight. If someone did a blind test, you would be hard pressed to identify them without pressing the buttons and feeling around. .

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Totally disagree with the above, the e-m5 felt awful in my hands while the e-m10 feels really good; had the e-m10 been out when I was in the market I might now be an Oly user. But what this really underlines s is the idea that you have to hold it in your hands.

The resolution of both evfs is 1.44 mpixel but the em10 has automatic brightness control. I found it does make a difference and appears 'cleaner'. The em10 also has a slightly higher rez LCD on the back.

About the ergonomics - the two are very close, check out the size and weight numbers. If you are just holding them, I do find that they are hard to tell apart. But the buttons are better placed and more tactile on the em10, so once you start operating them, the difference is felt.

About software - I really should create a detailed list of differences when I get the time. In addition to features like HDR, time composite, mysets assignable to dial positions and wifi, I keep finding new things every time I get into what I thought was a known menu. Sometimes there are more choices, or less restrictions, and sometimes completely new controls like the raw processing changes. As another example, you can configure the fn2 button to switch the front and back dials to ISO and white balance, a simpler version of the 2x2 switch available on the e-p5 and e-m1.

Thanks for clearing that out about the viewfinder. What other software improvements, if I may ask?

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The E-M10's EVF, while the same resolution as the E-M5's, can be set to use a higher refresh rate which makes it appear smoother in low light and when panning quickly. It also has an improved eyepoint so its easier to use for those that wear eyeglasses (if that's important to you)

So I decided to go to with an Oly OM-D ... Favour goes the the E-m10 BUT I might get the E-M5 because of the size...

Is it comfortable to handle? Are there any battery grips available for the e-m10 like there is for the e-m5? (I found none)
How is the viewfinder compared (em5 vs em10)?

The EM5 is older... but it has the battery grip.. Is it still worth buying? Probably yes... but choosing it over the EM10..

And just how much better is the EM1? Just to know. My wallet might not give me the opportunity to get it;.. but maybe.

Thanks guys

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You may want to wait till Photokina when I believe Olympus may introduce an E-M5 replacement with a higher MP (maybe 20 to 24MP) with faster AF and cheaper than the E-M1. E-M5 grip is better definitely against the E-M10 as the 10 is puny.

Another useful point to note about the E-M10 is that it's got electronic first curtain shutter ("0s Anti-Shock"). This removes any problems with shutter shock in the 1/90 to 1/320 range which IMHO is a pretty big deal. I found shutter shock to be a major issue on the E-P5 before the EFCS firmware upgrade. The E-M5 suffers far less than the E-P5 with shutter shock, but I've still observed it (mainly with the 75mm f1.8 lens) so it too could do with the EFCS firmware upgrade but all the indications are that Oly won't do it.

The E-M10's EVF, while the same resolution as the E-M5's, can be set to use a higher refresh rate which makes it appear smoother in low light and when panning quickly. It also has an improved eyepoint so its easier to use for those that wear eyeglasses (if that's important to you)

Got one for a family member to go with their E-M10. Works great for bigger lenses and with it off the E-M10 + pancake lens will fit in a cargo pant / jacket pocket. Best of both worlds.

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I use my ECG-1 Grip for all lenses. I put it on when I bought the camera and I love it! I do not like the E-M10 without it! I tried to take it away a couple of times but I always put it back within minutes!